The crooks in London know how it works. No one carries guns and no one resists the police. Then a new gang appears that go one better. They dress as police and steal from the crooks. This upsets the natural order of the police/criminal relationship and the police and the crooks join forces to catch the IPOs (Impersonating Police Officers), including an armoured car robbery in which the police must help the gangs to set a trap.
"The Wrong Arm of the Law" — movie produced in UK and released in 1963. It has a good rating on IMDb: 6.7 stars out of 10. It is a feature-length film with a runtime of 1h 34min. "The Wrong Arm of the Law" is not currently available to stream in undefined. Add it to your Watchlist and we'll notify you when you can watch it!